Question: What is the unit of length that starts with the letter 'z'?
Paraphrase: What is the unit of length that begins with the letter 'z'?
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q1978718 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'z')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: zettametre, zettametre, zeptometre, zeptometre, zira, zira, zhàng, zhàng